17-8 is 9.
It's 9, but this is the wrong subject.
The correct answer for the question that is being presented above is this one: "My puppy ripped apart his toys and then hid them around the house." The sentence that uses verb tenses correctly is this one, <span>My puppy ripped apart his toys and then hid them around the house because the verbs ripped and hid are both in past tense.</span>